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You won't have to worry about your headphones falling out during a tough workout with the PMX 680s. Designed by Sennheiser and adidas, they feature a rugged headband with an ergonomic behind-the-neck design that keeps the earbuds securely in place for running, lifting, and more. Kevlar® reinforced cabling plus a sweat- and water-resistant design ensure long-term durability. High-quality Sennheiser drivers and construction guarantee outstanding, high-energy sound.

The PMX 680s come with a built-in volume control that makes it easy adjust the sound without having to fumble with your player. If you wear your music player in an armband while exercising, the headphone's attached short cable is the perfect length to avoid getting tangled. If you need more cord length to put your player on a belt clip or in a pocket, just plug in the included extension cable and you're all set. A handy clothing clip helps keep the cord out of your way.

Product Highlights:

  • moisture-resistant construction
  • neckband design keeps the earbuds in place just inside the ear
  • in-line volume control
  • frequency response: 18-20,000 Hz
  • impedance: 16 ohms
  • 20" Kevlar®-reinforced cable with right-angle stereo mini plug, plus 24" extension cable
  • compatible with adidas miCoach, iPhone®, and all iPods® and MP3 players with a headphone miniplug
  • clothing clip
  • weight: 0.63 oz. (without cable)
  • warranty: 2 years
  • Our 60-day money-back guarantee

Sennheiser/adidas® PMX 680 Reviews

Average Customer Review:

5 Reviews

Great for running

Written by: BryanD from West Chester, PA on April 18, 2013

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

other earbuds kept falling out of my ears the second I started to sweat. These sit comfortably and don't move while running or sweating.

Pros: Very light, comfortable, don't move while sweating.


Good equipment

Written by: Dan from Ridgecrest, CA on February 3, 2012

Crutchfield Customer Review (What's this?)

These headphones work exactly as advertised. I use them with an arm band without the volume control. Go jogging about 7 miles and they stay in place the whole time. Very comfortable.

Pros: Comfortable, stay put, good sound.

Cons: Would prefer a different color (black), but not that important.

great with arm band

Written by: Susan from MA on January 30, 2012

I have used these headphones for a couple of years with an armband. I used it with the short cord and they are quite comfortable. They are not in the ear so not at all noise cancelling.The ear piece sits sideways in the ear which never bothered me until i pressed it with my hands and realized what it should sound like. I recently got an iphone so tried to use these with the extender cord instead of the arm band. There are problems with the control hanging so it swings uncomfortably and I cannot seem to clip it unless i do so at an awkward place on my side/stomach as it doesn't reach my waist. Would be fine if you keep you phone/ipod in a pocket or on the arm but i found the cord to be a hindrance with the control location (if kept ahead on a workout machine).

Pros: comfortable, flexible, washable, can opt to use a short cord

Cons: could fit closer to ear to block more outside noise, volume control is at an awkward distance so it hangs and swings when moving

Sennheiser/adidas® PMX 680

Written by: ToddC from Boston on May 18, 2011

Crutchfield Customer Review (What's this?)

Great headphones. When laying a flat bench, you may want to tilt them a bit so
that they do not pop out of your ears. Highly recommend them.



Very nice

Written by: Shane G from Marlton, NJ on January 4, 2011

Crutchfield Customer Review (What's this?)

Got these in today and the sound quality is great. I have a big head and these were still plenty big. In fact, it would be nice to have it fit a little more snug in the back. Very comfortable nonetheless. I'll give these a shot skiing this weekend.



Hands-on research

What's in the box?

Download owner's manual

  • In-ear headphones (with attached 20" cable terminated by a 3.5mm connector)
  • In-line volume control (with attached 24" cable terminated by a right-angle connector)
  • 1 Pair of foam ear-pads
  • Shirt-clip
  • Instruction Manual (Eng/Fre/Spa)

Features and Specs

Fit Style In-ear/Earbud
Earcup Type Closed
Noise-canceling No
Bluetooth No
Frequency Response 18-20k Hz
Sensitivity 120 dB
Impedance 16 Ohms
Weight 0.63 ounces
Cord Length 20"
Airline Adapter Included No
iPod Control No
Volume Control Yes
Built-in Microphone No
Parts Warranty 2 Years
Labor Warranty 2 Years

Product Research


Sports Design: The Sennheiser Adidas PMX680 sweat-proof, in-ear/neck-band headphones deliver outstanding, high-energy stereo sound during your workout.

Sweat & Water Resistant: The PMX680 headphones utilize sweat-proof, water-resistant construction for indoor and outdoor use during any season.

Neckband: The PMX680's neckband vertical transducer system provides a comfortable, secure fit that won't fall out during your workout. Furthermore, the PMX680 has a universal fit for any size or shaped head.

Kevlar Reinforced Cable: The DuPont Kevlar reinforced single-sided cable guarantees durability and flexibility, even in cold temperatures. The headphone cable features a gold-plated, right-angle 3.5mm connector.

In-Line Volume Control: The Sennheiser PMX680 sports headphones feature an in-line volume control to adjust the level of your music on the go.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.